[LLVMdev] Difficulty with reusing DAG nodes.

[Richard Pennington]

Eli Friedman wrote:
> I haven't looked at the rest of the email carefully, but why aren't
> you just implementing MULHU and MULHS?  There's no point to
> implementing the *MUL_LOHI variants if the processor doesn't have
> them.

I have implemented MULHU and MULHS. But if I take out my *MUL_LOHI 
stuff, the error I get is

[~/ellcc/ellcc] main% ./nios2-elf-ecc -S test.c
Cannot yet select: 0xaf93a34: i32,i32 = umul_lohi 0xaf9345c, 0xaf93924

What could I be doing to make the code generator think that umul_lohi is 
legal?

-Rich